Expression Interpretation Engine for Computer Map Visualizations

1. A computer-implemented method of editing and representing property values for a digital map, comprising: storing a library of expressions for styling a digital map, the library of expressions comprising at least one of data field lookup operations, logical operations, mathematical operations, string operations, and color operations; retrieving electronic map data from a style sheet corresponding to a vector map tile set for the digital map; displaying a user interface comprising: a property editor panel displaying a plurality of map styles that reference a portion of the electronic map data; and a visual map portion displaying a representation of the electronic map data with the map styles applied; for a selected map style, displaying in the property editor panel a plurality of style properties and a text field corresponding to a particular style property of the plurality of style properties for receiving expressions for the particular style property; receiving, via the text field, a portion of an expression to apply to the style property; determining, from the library of expressions, a set of suggested expressions corresponding to the style property based on the received portion of the expression; displaying at least one suggested expression of the set of suggested expressions at the property editor panel; retrieving inline documentation describing functionality of an expression for at least one suggested expression in the set of suggested expressions; displaying the retrieved inline documentation adjacent to the set of suggested expressions within the property editor panel; receiving user selection of a particular suggested expression from the displayed suggested expressions; applying the particular expression to the electronic map data for the style property; and rendering in the visual map portion an edited representation of the electronic map data for the style property with the particular expression applied.

2. The computer-implemented method of claim 1 , wherein the property editor panel is further configured to display the set of suggested expressions as part of a graphical control element adjacent to the at least one text field.

3. The computer-implemented method of claim 1 , wherein the at least one text field is part of the property editor panel.

4. The computer-implemented method of claim 1 , wherein the at least one text field is further configured to display an error message responsive to receiving a bad input.

5. The computer-implemented method of claim 1 , wherein the property editor panel further comprises an axis user interface.

6. The computer-implemented method of claim 5 , wherein the axis user interface is configured to set a range for an expression.

7. The computer-implemented method of claim 6 , wherein the range is at least one of a zoom range and data range.

8. The computer-implemented method of claim 1 , wherein the text field is configured to define a logical statement.

9. The computer-implemented method of claim 8 , wherein the logical statement is a data condition that applies a particular style to non-interpolatable data of the electronic map data.

10. The computer-implemented method of claim 1 , further comprising: receiving enablement of a fallback mode; and responsive to enablement of the fallback mode and to receiving user selection of a particular suggested expression from the displayed suggested expressions, requesting a confirmation action; wherein applying the particular expression to the electronic map data for the style property is responsive to enablement of the fallback mode and receiving the confirmation action.

11. A non-transitory computer-readable storage medium storing computer program instructions executable by a processor to perform operations of editing and representing property values for a digital map, the operations comprising: storing a library of expressions for styling a digital map, the library of expressions comprising at least one of data field lookup operations, logical operations, mathematical operations, string operations, and color operations; retrieving electronic map data from a style sheet corresponding to a vector map tile set for the digital map; displaying a user interface comprising: a property editor panel displaying a plurality of map styles that reference a portion of the electronic map data; and a visual map portion displaying a representation of the electronic map data with the map styles applied; for a selected map style, displaying in the property editor panel a plurality of style properties and a text field corresponding to a particular style property of the plurality of style properties for receiving expressions for the particular style property; receiving, via the text field, a portion of an expression to apply to the style property; determining, from the library of expressions, a set of suggested expressions corresponding to the style property based on the received portion of the expression; displaying at least one suggested expression of the set of suggested expressions at the property editor panel; retrieving inline documentation describing functionality of an expression for at least one suggested expression in the set of suggested expressions; displaying the retrieved inline documentation adjacent to the set of suggested expressions within the property editor panel; receiving user selection of a particular suggested expression from the displayed suggested expressions; applying the particular expression to the electronic map data for the style property; and rendering in the visual map portion an edited representation of the electronic map data for the style property with the particular expression applied.

12. The non-transitory computer-readable storage medium of claim 11 , wherein the property editor panel is further configured to display the set of suggested expressions as part of a graphical control element adjacent to the at least one text field.

13. The non-transitory computer-readable storage medium of claim 11 , wherein the property editor panel further comprises an axis user interface configured to set a range for an expression, the range comprising at least one of a zoom range and a data range.

14. The non-transitory computer-readable storage medium of claim 11 , wherein the text field is configured to define a data condition that applies a particular style to non-interpolatable data of the electronic map data.

15. The non-transitory computer-readable storage medium of claim 11 , the operations further comprising: receiving enablement of a fallback mode; and responsive to enablement of the fallback mode and to receiving user selection of a particular suggested expression from the displayed suggested expressions, requesting a confirmation action; wherein applying the particular expression to the electronic map data for the style property is responsive to enablement of the fallback mode and receiving the confirmation action.

16. A system, comprising: a processor; and a non-transitory computer-readable storage medium storing computer program instructions executable by the processor to perform operations of editing and representing property values for a digital map, the operations comprising: storing a library of expressions for styling a digital map, the library of expressions comprising at least one of data field lookup operations, logical operations, mathematical operations, string operations, and color operations; retrieving electronic map data from a style sheet corresponding to a vector map tile set for the digital map; displaying a user interface comprising: a property editor panel displaying a plurality of map styles that reference a portion of the electronic map data; and a visual map portion displaying a representation of the electronic map data with the map styles applied; for a selected map style, displaying in the property editor panel a plurality of style properties and a text field corresponding to a particular style property of the plurality of style properties for receiving expressions for the particular style property; receiving, via the text field, a portion of an expression to apply to the style property; determining, from the library of expressions, a set of suggested expressions corresponding to the style property based on the received portion of the expression; displaying at least one suggested expression of the set of suggested expressions at the property editor panel; retrieving inline documentation describing functionality of an expression for at least one suggested expression in the set of suggested expressions; displaying the retrieved inline documentation adjacent to the set of suggested expressions within the property editor panel; receiving user selection of a particular suggested expression from the displayed suggested expressions; applying the particular expression to the electronic map data for the style property; and rendering in the visual map portion an edited representation of the electronic map data for the style property with the particular expression applied.

17. The system of claim 16 , wherein the property editor panel is further configured to display the set of suggested expressions as part of a graphical control element adjacent to the at least one text field.

18. The system of claim 16 , wherein the property editor panel further comprises an axis user interface configured to set a range for an expression, the range comprising at least one of a zoom range and a data range.

19. The system of claim 16 , wherein the text field is configured to define a data condition that applies a particular style to non-interpolatable data of the electronic map data.

20. The system of claim 16 , the operations further comprising: receiving enablement of a fallback mode; and responsive to enablement of the fallback mode and to receiving user selection of a particular suggested expression from the displayed suggested expressions, requesting a confirmation action; wherein applying the particular expression to the electronic map data for the style property is responsive to enablement of the fallback mode and receiving the confirmation action.